I just bought a bobcat 600 that had the variable speed unhooked. The hydraulic line is no longer there and the fitting on the valve is capped off now. It sure looks like it has been this way for a very long time. The sheave is complete and I was able to get the first snap ring and cap off as well as the large snap ring holding the whole piston assemble inside the sheave. I have however not been able to get the piston unit to come out of the sheave. I have check and checked again for a possible bur or damage to the boar of the sheave which would cause it to get stuck but I see nothing. What is the trick to getting that whole piston unit pulled out? I suspect that it was unhooked due to a leak or that is what I am hoping so maybe it will be an easy fix. Also, another question which I think I have done my best to address is sealing the Wisconsin manifold to the heads? My manifold is not in the best of shape with a good bit of erosion which will keep the flanges from sealing correctly. I cleaned up all the exhaust mating surfaces and uses a bronze brazing rod to add a little material to the flange then ground it all level with the intake flanges which are in good shape. I believe the manifold will seal well now but is there any tricks to keeping them sealed up over time?